Alarm device



ALamm@ v 2 sheets-sheet 1 A. S. WADDINGTON ALARM Dgvca Filed Augf 16, 1924 By his ALLys.

June 2, 1925.- Y 1,539,979

A. s. WADDINGTON A ALARM DEVI CE Filed Aug, 16, 1924 2 Sheetwsheet a Abm- //n BY his Mt; 7""

A w h I f l v vWEDjs'rArEs4 PATENT OFFICE.

ARTHUR SAMUEL wAnniNeroN, or LoNnoN, ENGLAND, AssIeNoa or ONE-HALF To wAnniNGroN TAMPEarnoor TAXIMVETERSLIMiTED, or LoNnoN, ENGLAND'.

ALARM .nevicay f V'Appneation sieaAugust 1e, 1924. semi Nb. 732,591.

To all fio/tom if may concern.'

Beit known that I, ARTHUR SAMUnL VVADDINGTON, a subject ofthe King of Great Britain, residing` at 182 Thames Road, Chiswick, London, England, have invented new and useful Improvements in Alarm Devices, of which the following is a specification.

This invention relates `to improvementsv in apparatus of the type comprising a circuit which is automatically closed bymeans operable by inertia, an alarm actuated by the closing of the circuit, and means for breaking the circuit after a predetermined lapse of time.

According to the present invention I provide a motor which is set intov motion by the closing .of the circuit, and I provide means actuated by the rotation of the arma-ture shaft of the said motor yfor automatically shutting loff the supply of current to the motor after a predetermined interval of time. j

AIn one form of construction the armature shaft is provided with loneor morehan'r mers which strike an alarm bell, and iwithf one or more centrifugally `operated clutch members, which, .when kthejarmature shaft has obtained a given speed, engagea drum rotatably mounted on the said shaft,` the v drum being provided with means such as a projection or cam adapted tobreak the circuit which conveys current to the eld wind' ings of the motor. The circuit isy automatically closed when the apparatus is moved by a contact mounted on an Varmaturesuspended by a sprinov close to the poles of the motor in such a manner that when ,the apparatus is moved, thearmature moves relatively to the motor and the contact touches a second contact which is fixed in relation j j 11 is a'brake drum so mounted that 1t 'can to the vmotor. So long las current lflows through the windings the spring `suspended armature is attracted to the poles, thus keepy ing the circuit closed until vit is broken by thecam. c ,e 'In aV modification the contact carriedby theV spring suspended armature is `moved out of engagement with theA fixed contact to break the circuit by a projection on a diskA ployed'to operate an electric horn on a motor vehicle whenever the vehicle is nio-ved or shaken asv would occur, for example, when any person opened a door, or stepped upon the ruiming board thereof.

The circuit may if desired be closed from a distance by other means operable by inertia. Such means may comprise a metallic tube and a metallic weight suspended within the tube but normally out of contact therewith; the tube and weight are confnected in the motor circuit in such a man ner that, when the tube is moved, it makes contact with the weight and so closes the circuit.

Preferably means are provided for Vadjusting either the scnsitiveness of the armature suspension and/or thefother circuitclosingv devices which complete the circuit when the apparatus is moved or vibrated.

vIn the accompanying drawings which illustrate the invention, Figure l is a sectional elevation, Figure 2 a plan of Figure 1`,Figures 3, 4 and 5 ,detail views, Figure 6 a detail of a modification, Figure 7 a diagram showing the wiring, Figuref` a diagram `showing a modification, andjFigure 9 a detail drawing.- Y

Referring to Figures 1 to 5, 1 is a case in which: an electric motor v2 is secured. 3 is the armature shaft of the said motor having fast on it a disk 4. 5 are studs secured in the weights 6 which are freeto move a certain amount in a plane parallel with the disk 4. 7. is yapplatei which is held in position by a screw V8 and serves to retain the weights G. 9 is a bell secured to the case 1 and provided with a projection 10 against which the weights 6 strike when the disk 4 is rotated.

rotatefreely on the armature shaft 3.1' The lbrakefdrum isweighted at 12 and the eX- disk"4 'and serving tolimit the movement 'of lll) au electrical diagram 'tor use inA connectioir with the arrangement just described, Y24 `*is a battery. 25 is a brass tube suspended from a support. and having` a plug 27 of insulating material at its upper endafroni the centre otwhich a metal chain 28 is suspended. 29`is a metal weightsuspended -from the chain 28. 30 isfa lampV Connected in parallel with the terminals of the motor.

ynoperatiOn thescrew 23 is adjusted so that if the contactfscrew 19 be touching the stud 20 when the drum 11 is rot-ated, the part 12 will come in contact-with lthe screw 23 and break the Contact between the'screw 19 and stud129.'V The screw 19 can be' setso closeito thestud- 29that any movement of the caselwill canse the strip 1G to Vvibintewhich will result in contactbcing.made between the screw 19 and the stud 20. henthis occurs, current flows through the motor 2 and the armature 15is attracted lby the held' magnets of the motor, softhat so'long as current is flowing 'through the field coils, the

contact'screw '19Y remains in contact with the stud 2O.- Whenk current Aitlows ythrough the motor, the armature shaft 3, together with the disk Vj4, is rotated, the weights 6 are then flungout bycentriingal force and makef Contact with the projection. 10 on lthe belll 9, thus givingfan alarm.Y As soon asthe armature` shaft 3 has gathered suliicient' speed, the brake shoes 13 aremoved outwards by centrifugal forceand 1nake= contact with the brake drum A11. W'hen vthis occurs, the brake drum 11 is rotatedand the part 12 thereotcomes against the screw 23 and. breaks contact between the contact screwV 1.9 and studl20, thus shutting-:off Vcurrent from the motor.

Vhen the motor is at rest, the part 12v oi? thebrake drum ll returns to its original position, as shown in Figure 1. The motor may also'be put into to a door or to a window'or may be hooked on to coats or other garments hanging from a f rack; When the support 26 is moved, the p plug29 makes contactv with the tube 25 and allows current to How throughfthe motor 2.

lVhen this occurs, the armature is' at-r tracted by the polepieces of the motor andV Contact .is made'betweenthe screw 19l and stud V2O 'so that the bell is soundedVin the motor, a portion. thereof also Vflows through" the lamp 30 which may conveniently be lo- 26 of insi'llating material action and tliebell 9 i rung it the support 26 be moved; This sup-` port may, for example, obviously `be secured cated'near to the support'26 so as to shine on. the person causing the support to move, as is shown diagrami'natically in Figure 9.

Figure 6 shows anfalternative arrangement for completing the motor circuitwhenits support, which may, for example, be a win dow, is moved. The arrangement comprises two strips 31, 32, of flexible conducting material 'having contact studs 33, 34. Prefer ably the strips are of different length or flexibility and one oit them is also preferably provided with a screw by means of 'which thergap between the studs 33, 34,' can be ad'usted.`

lTigure-Sshows an alternative form` of apparatus for Ilimiting' the duration of the alarm, the apparatus being shown' 'connected to a Klaxon or the like electric horn. In this modification the armature' sh'aft' has fast'on .it a pinion 3G"in"mesh with a'pinion' 374 fast' on a worm shaft' 38V which latter gears with a worm wheel 39 tast' with4 apinion 40 in mesh with a gear wheel 41 'mounte ed on a shaft 42. The gear wheel 41 is provided witha projecting cani 43 adapted to make contactwith the screw 23. Fast on the shaft'42is a heart-shaped cam 44:011 to whicha roller 45 mounted on a rod 4Gpivoted at 47 lis drawn into contact by'a spring 48; 49'is a 'Kla'xon' horn.

In'operation' when 'current is supplied 'to the motor 2 either lby moving its case 1 (not shown) f or by moving .the insulated support 26, the gearwheel' 41 is rotated and after the peak of the cam '44 Vhas passed the' roller45,

the cam 43 'breaks contact' between the lscrew 19 'and 'stud 20,and current isfshut of'lfrom the ,motora Thev armature shaft 3, however, continuesto rotate owing'fto' the roller 45 Awhich is pressed into Contact'withthe'cam' 44 bythe spring .48'until the ca`m`44 4and gearwheel` 41 have returned to their original` position, as shown in FigureS.

1.` An alarm mechanism comprising. a'mol tor including'an armature', a normally open circuit therefor including" a vibration oper-4 ated circuitcloser, means operated uponenn ergization" of said motors-tor maintaining" said circuit closed, an`alarm, meansV oper-r ated by* rotation et vthe armature Vfor soundin the-alarm, and means including a cen# trlfugally operated clutch operated by the rotation of said armature forjactuati'ng said circuitcloserto open thecircuit 'when said armature vattainsa predetermlned speed.'

2.r An' alarm circuit comprising a motorr including an' armature andv a field,i a ynormally open circuit therefor' including' a vi brationoperat'ed 'circuit closer, means oper` erating said alarm and means including a centrifngally operated clutch operated by rotation of said armature for moving said circuit closer to open position for-opening said circuit when the armature attains a predetermined speed.

3. An alarm mechanism comprising a motor including an armature, a no rmally open circuit therefor including ak vibration operated circuit closer, means whereby energization of said motor will normally hold the circuit closed, an alarm means operated by rotation of the armature for sounding the alarm, and means for actuating the circuit closer to open the circuit when the armature' attains a predetermined speed.

4. An alarm mechanism comprising a mo tor including an armature having a shaft, a normally open circuit therefor including a vibration operated circuit closer, means whereby energization of said motor Will normally hold the circuit closed, 'an alarm,

meansoperated by rotation of the armatureV shaft for sounding the alarm, a disk fast on the armature shaft, a drum loosely mounted Von said shaft, Weights pivoted Von the disk and adapted to engage' the drum under the influence of centrifugal force when thel ar-v mally hold the circuit closed, a disk fast on f the shaft, movable means carried by the shaft, analarm operated by said means when said disk is rotated and means actuated by the rotation of the armature shaft when -it attains a predetermined speed for actuatingk the circuit closer to open the circuit.

In testimony that I claim the foregoing as-v my invention Iy have signed my name this seventh dayV of August, 1924.

ARTHUR SAMUEL WADDINGTON. 

